For orientation note A) Allantois, B) Allantoic vessels, C) Chorionic membrane, D) Junction of fetal villi and maternal crypts, E) Uterine glands, and F) Myometrium. Several MICROPLACENTOMES are visible. Each microplacentome is formed by interdigitation of a MICROCOTYLEDON on the chorion with a MICROCARUNCLE on the uterine endometrium.